Pelvic contraction any contraction of the pelvic diameters that diminishes the capacity of the pelvis can creat dystocia during labor
Pelvic contraction ◼any contraction of the pelvic diameters that diminishes the capacity of the pelvis can creat dystocia during labor
Pelvic contraction Classification Contraction of the pelvic inlet contraction of the midpelvis and pelvic outlet general contraction of the pelvis ▣pelvic deformities
Pelvic contraction Classification Contraction of the pelvic inlet contraction of the midpelvis and pelvic outlet general contraction of the pelvis pelvic deformities
Contracted pelvic inlet Criteria for contraction: I (marginal contraction): Sacral-pubic D 18cm,conjugate D10cm,trial labor ll (comparative contraction):Sacral-pubic D 16.5~17.5cm,conjugate D 8.5~9.5 cm, trial labor for a short time. Ill (absolutely contraction):Sacral-pubic D ≤16cm,conjugate of inlet:≤8.0cm,uterine incision delivery
Contracted pelvic inlet Criteria for contraction: Ⅰ（marginal contraction）: Sacral-pubic D 18cm, conjugate D10cm，trial labor . Ⅱ（comparative contraction）: Sacral-pubic D 16.5 ～17.5cm, conjugate D 8.5～9.5 cm， trial labor for a short time. Ⅲ（absolutely contraction）: Sacral-pubic D ≤16cm, conjugate of inlet≤8.0 cm,uterineincision delivery
classification ▣simple flat pelvis rachitic flat pelvis 0 单纯扁平骨盆 佝偻病性扁平骨盆
classification simple flat pelvis rachitic flat pelvis
clinical manifestation Floating vertex presentation with no descent during labor ▣abnormal labor Prolapsed cord or extremity Prolonged rupture of the membrane If allowed to continue- Bandl's retraction ring,frank uterine rupture
clinical manifestation Floating vertex presentation with no descent during labor abnormal labor Prolapsed cord or extremity Prolonged rupture of the membrane If allowed to continue- Bandl`s retraction ring,frank uterine rupture